package com.wan.server.util;

import org.csource.common.MyException;
import org.csource.fastdfs.*;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.core.io.ClassPathResource;
import org.springframework.web.multipart.MultipartFile;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;


/**
 * Description:
 * date: 2022/2/27 13:56
 *
 * @author 万富
 * @since JDK 1.8
 */
public class FastDFSUtils {
    private static Logger logger = LoggerFactory.getLogger(FastDFSUtils.class);

    /**
     * 初始化客户端
     * ClientGlobal.init 读取配置文件，并初始化对应的属性
     */
    static {
        try {
            String filePath = new ClassPathResource("fdfs_client.conf").getFile().getAbsolutePath();
            ClientGlobal.init(filePath);
        } catch (Exception e) {
            logger.error("初始化DFS失败+3"+e.getMessage());
        }
    }

    /**
     * 下载文件
     * @param groupName
     * @param remoteFileName
     * @return
     */
    public static InputStream downFile(String groupName,String remoteFileName){
        StorageClient storageClient = null;
        FileInfo fileInfo = null;
        try {
            storageClient =   getStorageClient();
            byte[] fileByte = storageClient.download_file(groupName, remoteFileName);
            InputStream inputStream = new ByteArrayInputStream(fileByte);
            return inputStream;
        } catch (Exception e) {
            logger.error("文件下载失败"+e.getMessage());
        }
        return null;
    }

    /**
     * 删除文件
     * @param groupName
     * @param remoteFileName
     */
    public static void deleteFile(String groupName,String remoteFileName){
        StorageClient storageClient = null;
        FileInfo fileInfo = null;
        try {
            storageClient =   getStorageClient();
            storageClient.delete_file(groupName, remoteFileName);
        } catch (Exception e) {
            logger.error("文件删除失败"+e.getMessage());
        }
    }



    /**
     * 获取文件信息
     * @param groupName
     * @param remoteFileName
     * @return
     */
    public static FileInfo getFileInfo (String groupName,String remoteFileName){
        StorageClient storageClient = null;
        FileInfo fileInfo = null;
        try {
            storageClient =   getStorageClient();

            return storageClient.get_file_info(groupName, remoteFileName);
        } catch (Exception e) {
            logger.error("文件信息获取失败"+e.getMessage());
        }
        return null;
    }

    /**
     * 上传文件
     * @param file
     * @return
     */
    public static String[] upload(MultipartFile file){
         String filename = file.getOriginalFilename();
        logger.info("文件名："+filename);

        StorageClient storageClient = null;
        String[] uploadFile = null;

        try {
            storageClient = getStorageClient();
            uploadFile = storageClient.upload_file(file.getBytes(), filename.substring(filename.indexOf('.') + 1), null);
        } catch (Exception e) {
            logger.error("文件上传失败！"+e.getMessage());
        }

        if (null == uploadFile){
            logger.error("上传失败",storageClient.getErrorCode());
        }
        return uploadFile;
    }


    /**
     * 客户端
     * @return
     * @throws IOException
     */
    private static StorageClient getStorageClient() throws IOException {
        TrackerServer trackerServer = getTrackerServer();
        StorageClient storageClient = new StorageClient(trackerServer, null);
        return storageClient;

    }


    /**
     * 生成tracker 服务器
     * @return
     * @throws IOException
     */
    private  static TrackerServer getTrackerServer() throws IOException {
        TrackerClient trackerClient = new TrackerClient();
        TrackerServer trackerServer = trackerClient.getTrackerServer();
        return trackerServer;
    }

    /**
     * 获取文件服务器的url
     *
     * @return
     */
    public static String getTrackerUrl() {
        TrackerClient trackerClient = new TrackerClient();
        TrackerServer trackerServer = null;
        StorageServer storeStorage = null;
        try {
            trackerServer = trackerClient.getTrackerServer();
            storeStorage =  trackerClient.getStoreStorage(trackerServer);

        } catch (Exception e) {
            logger.error("文件路径获取失败"+e.getMessage());
        }
        return "http://"+storeStorage.getInetSocketAddress().getHostString()+":8888/";
    }


}
